Providers Richard Grenell, PT to Courtney Grenning
300 individual NPIs in the federal registry, part 8,308 of 24,427 of the A to Z by surname. Each row is the registry's record: the name and credential, the NPI, the primary specialty, the practice city and the year the NPI was issued. 101 link to a page of their own with Medicare and CMS data the registry does not carry.
| Provider | NPI | Specialty | Practice city | NPI issued |
|---|---|---|---|---|
| Richard Grenell, PT | 1306821418 | Physical Therapist | Green Bay, WI | 2005 |
| Stacy Grenell, RN | 1154027464 | Medical-Surgical Registered Nurse | Windsor Heights, IA | 2023 |
| Steven Grenell, M.D. | 1831115872 | Neurology Physician | New York, NY | 2006 |
| Walter Grenell, DO | 1669714994 | Emergency Medical Services (Emergency Medicine) Physician | Wheat Ridge, CO | 2013 |
| Melody Grenelle, DPT | 1518327683 | Physical Therapist | Lincoln, NE | 2016 |
| Paul Grenelle, P.A. | 1982901856 | Medical Physician Assistant | Daytona Beach, FL | 2011 |
| William Grenelle, D.C. | 1265885784 | Chiropractor | Largo, FL | 2016 |
| Gerald Greneman | 1780723304 | Rehabilitation Practitioner | Pasadena, CA | 2007 |
| Kristin Grenemyer, RN | 1245736693 | School Registered Nurse | Albuquerque, NM | 2018 |
| Timothy Grenemyer, DO | 1588699391 | Family Medicine Physician | Albuquerque, NM | 2006 |
| Ellen Grenen, LSW | 1093341513 | Clinical Social Worker | Chicago, IL | 2020 |
| Nathanael Grener, PTA | 1912437625 | Physical Therapy Assistant | Homosassa, FL | 2017 |
| Alan Grenert | 1346138237 | Student in an Organized Health Care Education/Training Program | Camp Lejeune, NC | 2025 |
| James Grenert, MD | 1174572390 | Anatomic Pathology Physician | San Francisco, CA | 2006 |
| Stephanie Grenert, RD, LD | 1255875076 | Registered Dietitian | Birmingham, AL | 2016 |
| Elizabeth Grenesko | 1639026149 | Peer Specialist | Saginaw, MI | 2026 |
| Emily Grenesko-Stevens, LMFT | 1417336777 | Marriage & Family Therapist | Northfield, IL | 2015 |
| Eduardo Grenet, M.D. | 1669540993 | Family Medicine Physician | Fort Lauderdale, FL | 2006 |
| Julie Grenet, PH.D., L.P. | 1598075582 | Psychoanalyst | New York, NY | 2010 |
| Justin Grenet, MD | 1770102915 | Hematology & Oncology Physician | Santa Rosa, CA | 2020 |
| Natalia Grenett, PA-C | 1639578289 | Physician Assistant | Birmingham, AL | 2014 |
| Niya Grenevich, MS | 1902180771 | Professional Counselor | Pottstown, PA | 2011 |
| Lance Grenevicki, MD, DDS, FACS | 1255306866 | Oral & Maxillofacial Surgery (D.M.D.) | West Melbourne, FL | 2006 |
| Becky Grenfell, LPCC | 1780994251 | Professional Counselor | Agoura Hills, CA | 2010 |
| Chelsea Grenfell | 1154849602 | Social Worker | Upland, CA | 2017 |
| Derek Grenfell, D.C. | 1972908895 | Chiropractor | Sturgeon Bay, WI | 2014 |
| Donna Grenfell, PA | 1700801107 | Physician Assistant | De Pere, WI | 2006 |
| Emily Grenfell, PAC | 1801363064 | Physician Assistant | Cleveland, OH | 2018 |
| Gina Grenfell, D.D.S. | 1942568787 | Dentist | Sturgeon Bay, WI | 2012 |
| Janice Grenfell, SLPA | 1013289545 | Speech-Language Assistant | Surprise, AZ | 2012 |
| Jessica Grenfell, DDS | 1447756408 | Pediatric Dentistry | Brooklyn, NY | 2018 |
| Kathryn Grenfell, PA-C | 1124618111 | Physician Assistant | Cleveland, OH | 2021 |
| Natalie Grenfell | 1174130504 | Marriage & Family Therapist | Burien, WA | 2020 |
| Nina Grenfell, LMT | 1285940189 | Massage Therapist | Fryeburg, ME | 2010 |
| Raphael Grenfell, PTA | 1265080147 | Physical Therapy Assistant | Menifee, CA | 2019 |
| Raymond Grenfell, MD | 1780899922 | Endocrinology, Diabetes & Metabolism Physician | Jackson, MS | 2007 |
| Sarah Grenfell, LMT | 1114515277 | Massage Therapist | Missoula, MT | 2021 |
| Susan Grenfell | 1659409969 | Marriage & Family Therapist | Eureka, CA | 2007 |
| Tchelsea Grenfell, LICSW | 1245609221 | Clinical Social Worker | Salem, MA | 2015 |
| Whitney Grenfell | 1043685902 | Speech-Language Pathologist | Omaha, NE | 2015 |
| Raymond Grenfell, Jr., M.D. | 1851309165 | Endocrinology, Diabetes & Metabolism Physician | Jackson, MS | 2006 |
| Rachael Grenfell-Dexter | 1033661160 | Acute Care Nurse Practitioner | Brooklyn, NY | 2016 |
| Audrey Grenga, MD | 1467849448 | Neurological Surgery Physician | Wright Patterson Afb, OH | 2015 |
| Paolo Grenga, MD | 1699160044 | Emergency Medicine Physician | Kettering, OH | 2015 |
| Tad Grenga, MD | 1124009253 | Plastic Surgery Physician | Suffolk, VA | 2005 |
| Jamie Grenger, DPT | 1346047859 | Physical Therapist | Manasquan, NJ | 2025 |
| Amber Grengs, BCBA | 1316453442 | Behavior Analyst | Watertown, SD | 2017 |
| Casey Grengs | 1699421685 | Behavior Technician | Minneapolis, MN | 2022 |
| Laurie Grengs, M.A. | 1710198940 | Counseling Psychologist | Coon Rapids, MN | 2007 |
| Stacy Grengs, CMT | 1679763072 | Specialist | Foley, MN | 2007 |
| Anne Grenham, B.S | 1306131594 | Student in an Organized Health Care Education/Training Program | Brockton, MA | 2011 |
| Cara Grenham, THERAPEUTIC MENTOR | 1659628113 | Social Worker | Haverhill, MA | 2012 |
| Jami Lynne Grenham | 1114692316 | Addiction (Substance Use Disorder) Counselor | Pasadena, CA | 2021 |
| Richard Grenhart, PSY.D. | 1083736540 | Clinical Psychologist | Bayfield, CO | 2007 |
| Susan Greni, MD | 1487339867 | Neurological Surgery Physician | Omaha, NE | 2023 |
| Lori Grenich, MS, MSN, RN, CNP | 1871586040 | Adult Health Nurse Practitioner | Columbiana, OH | 2005 |
| Lynn Grenie-Poirier, BA, MSW | 1790534816 | Clinical Social Worker | Stoughton, WI | 2024 |
| Aimee Grenier, LPN | 1811521594 | Licensed Practical Nurse | Woonsocket, RI | 2020 |
| Alaina Grenier, RN | 1346196540 | Registered Nurse | Bowling Green, KY | 2026 |
| Alexandrea Grenier | 1063308666 | Behavior Analyst | Warren, RI | 2025 |
| Alyssa Grenier | 1881524973 | Behavior Technician | Savannah, GA | 2026 |
| Andre Grenier, DMD | 1295929040 | Periodontics | Plantation, FL | 2007 |
| Anique Grenier | 1134097231 | Behavior Technician | Denver, CO | 2025 |
| Ann-Marie Grenier | 1659723252 | Dental Hygienist | S Portland, ME | 2016 |
| Anne Grenier, LICSW | 1750037149 | Professional Counselor | Shrewsbury, MA | 2022 |
| Bethany Grenier | 1063905644 | Developmental Therapist | Worcester, MA | 2018 |
| Britni Grenier, PT | 1962722736 | Physical Therapist | Bowie, MD | 2010 |
| Brittany Grenier | 1194269894 | Mental Health Counselor | Norwich, CT | 2016 |
| Brittany Grenier | 1275215758 | Behavior Technician | Clinton, MS | 2023 |
| Brittany Grenier | 1396187258 | Developmental Therapist | Milford, MA | 2013 |
| Brittany Grenier, DMHW | 1578112306 | Mental Health Counselor | Pittsburg, CA | 2019 |
| Brock Grenier, OT | 1407501497 | Occupational Therapist | Green Bay, WI | 2022 |
| Brooke Grenier | 1508751439 | Behavior Technician | Elkhart, IN | 2025 |
| Caitlin Grenier, M.S. | 1609048354 | Speech-Language Pathologist | San Diego, CA | 2008 |
| Callie Grenier, FNP-C | 1275099723 | Family Nurse Practitioner | Chelmsford, MA | 2019 |
| Carrie Grenier | 1225982226 | Chore Provider | Omaha, NE | 2026 |
| Catherine Grenier, MD | 1740396894 | Pediatrics Physician | Springfield, OR | 2006 |
| Charles Grenier | 1932179868 | Physician Assistant | Santa Cruz, CA | 2006 |
| Charlie Grenier, PPS, MS | 1922966191 | School Counselor | San Marcos, CA | 2026 |
| Christine Grenier, PHARMD | 1427208917 | Pharmacist | Aurora, CO | 2008 |
| Christopher Grenier, M.D. | 1700818135 | Ophthalmology Physician | Baton Rouge, LA | 2006 |
| Dana Grenier, FNP-BC | 1003287947 | Family Nurse Practitioner | Rock Springs, WY | 2015 |
| Daniel Grenier, D.O. | 1881825461 | Emergency Medicine Physician | Parkland, FL | 2009 |
| Danielle Grenier, APRN, FNP-C | 1174289094 | Nurse Practitioner | Cheshire, CT | 2021 |
| Denise Grenier, MSW, LCSW | 1427219062 | Clinical Social Worker | Tucson, AZ | 2008 |
| Donald Grenier, MSN, PMHNP | 1932980133 | Psychiatric/Mental Health Nurse Practitioner | Manchester, VT | 2023 |
| Donna Grenier, RN | 1740521988 | Registered Nurse | Independence, OR | 2013 |
| Elise Grenier, M.D. | 1184634800 | Family Medicine Physician | San Francisco, CA | 2006 |
| Elizabeth Grenier, RN, CRNA | 1427549997 | Certified Registered Nurse Anesthetist | Portland, ME | 2018 |
| Ellen Grenier, M.E.D. | 1740605898 | Speech/Language/Hearing Specialist/Technologist | Longmeadow, MA | 2014 |
| Emily Grenier | 1407525330 | Behavior Technician | Worcester, MA | 2021 |
| Eric Grenier, M.D. | 1649595109 | Adult Reconstructive Orthopaedic Surgery Physician | Fort Belvoir, VA | 2010 |
| Eric Grenier | 1659973972 | Pharmacist | South Portland, ME | 2020 |
| Erika Grenier | 1659041796 | Behavior Technician | Miami, FL | 2021 |
| Ernesto Grenier, M.D. | 1366614927 | Psychiatry Physician | Miami, FL | 2008 |
| Gregory Grenier, D.O | 1134512593 | Orthopaedic Surgery Physician | Billings, MT | 2015 |
| Haley Grenier | 1457824930 | Mental Health Counselor | Newton, MA | 2019 |
| Hannah Grenier | 1053723122 | Speech-Language Assistant | Waterville, ME | 2014 |
| Isabelle Grenier, MS, OT/L, SIPT | 1013054709 | Occupational Therapist | Goffstown, NH | 2007 |
| Isabelle Grenier, LMHC | 1417670597 | Mental Health Counselor | Cambridge, MA | 2022 |
| Ivan Grenier, ARNP | 1295348654 | Psychiatric/Mental Health Nurse Practitioner | Miami, FL | 2020 |
| Ivania Grenier, ARNP | 1760792097 | Family Nurse Practitioner | Miami, FL | 2010 |
| Ivy Grenier, PTA | 1174388904 | Physical Therapy Assistant | Charlestown, NH | 2024 |
| Jaclyn Grenier, DPT | 1548878580 | Neurology Physical Therapist | Malvern, PA | 2020 |
| Jacqueline Grenier, R.N. | 1336414705 | School Registered Nurse | Bayside, NY | 2012 |
| Jacqueline Grenier, RN NP | 1770832727 | Psychiatric/Mental Health Nurse Practitioner | Worcester, MA | 2012 |
| James Grenier, PHARM D | 1639401052 | Pharmacist | Gouverneur, NY | 2010 |
| Janell Grenier | 1639670342 | Massage Therapist | Nikiski, AK | 2018 |
| Jazzlyn Grenier, PA-C | 1194614974 | Physician Assistant | Hershey, PA | 2025 |
| Jeffrey Grenier, HIS | 1669194551 | Hearing Instrument Specialist | Guilford, CT | 2022 |
| Jennessa Grenier, LCSW | 1326278847 | Clinical Social Worker | Torrington, CT | 2009 |
| Jennifer Grenier | 1992518344 | Mental Health Counselor | Liberty, MO | 2025 |
| Jeremy Grenier, MD | 1679131965 | Pediatric Hematology & Oncology Physician | Philadelphia, PA | 2019 |
| Jillian Grenier, ORT/L | 1053693176 | Occupational Therapist | Suffolk, VA | 2011 |
| Joanne Grenier, MOT, OTR/L | 1720447337 | Occupational Therapist | Keene, NH | 2016 |
| Jocelyn Grenier, PA | 1306848957 | Surgical Physician Assistant | Coral Springs, FL | 2005 |
| John-Paul Grenier, M.D. | 1366977092 | Diagnostic Radiology Physician | New York, NY | 2017 |
| Joshua Grenier | 1972973675 | Dentist | Otisfield, ME | 2015 |
| Julie Grenier | 1275780249 | Home Health Registered Nurse | Guilderland, NY | 2008 |
| Julienne Grenier, M.A., CCC/A | 1114198595 | Audiologist | Houston, TX | 2008 |
| Karl Grenier, MD, PHD | 1154109478 | Pediatric Pathology Physician | Philadelphia, PA | 2023 |
| Katelyn Grenier, M.A | 1891134755 | Mental Health Counselor | Milford, MA | 2013 |
| Kathleen Grenier, LCSW | 1609076017 | Clinical Social Worker | Coconut Creek, FL | 2007 |
| Kayla Grenier | 1255067914 | Physician Assistant | Davenport, IA | 2022 |
| Kellee Grenier, DPT | 1407306392 | Physical Therapist | Wasilla, AK | 2016 |
| Kevin Grenier, DPM | 1609258326 | Student in an Organized Health Care Education/Training Program | Yorba Linda, CA | 2015 |
| Kimberly Grenier, LPCC | 1699047704 | Mental Health Counselor | Columbus, OH | 2012 |
| Kristie Grenier, L.P.N. | 1063494110 | Licensed Practical Nurse | Fort Leavenworth, KS | 2005 |
| Kristin Grenier, L.P.T.A. | 1043430390 | Physical Therapy Assistant | Delavan, WI | 2007 |
| Kylie Grenier | 1124680723 | Registered Dietitian | Worcester, MA | 2019 |
| Laura Grenier, PT | 1073608501 | Physical Therapist | Utica, NY | 2006 |
| Lauren Grenier | 1144879727 | Clinical Psychologist | Concord, MA | 2019 |
| Lauren Grenier | 1568895605 | Mental Health Counselor | Hingham, MA | 2013 |
| Liesl Grenier, M.D. | 1003139718 | Dermatopathology Physician | Bethesda, MD | 2010 |
| Lorrie Grenier, RC | 1699837062 | Counselor | Vancouver, WA | 2006 |
| Lory Grenier, PT | 1013289420 | Physical Therapist | Salem, NH | 2012 |
| Lourdes Grenier, MSW | 1851355432 | Social Worker | Miami, FL | 2006 |
| Maggie Grenier, LPC | 1285436055 | Professional Counselor | Thatcher, AZ | 2025 |
| Mandy Grenier, BS | 1609395888 | Addiction (Substance Use Disorder) Counselor | Tawas City, MI | 2017 |
| Marc Grenier, M.D. | 1104825850 | Legal Medicine | Bradenton, FL | 2005 |
| Marc Grenier, CRNA | 1942247218 | Certified Registered Nurse Anesthetist | Columbus, GA | 2006 |
| Marie-Lyne Grenier, OT | 1811271877 | Hand Occupational Therapist | Allentown, PA | 2011 |
| Mark Grenier, DMD | 1275926834 | Dentist | Dartmouth, MA | 2015 |
| Mark Grenier, RN | 1467631747 | Registered Nurse | Fabius, NY | 2007 |
| Marlene Grenier, ARNP | 1629041918 | Nurse Practitioner | Tampa, FL | 2006 |
| Matthew Grenier | 1477195360 | Addiction (Substance Use Disorder) Counselor | Flint, MI | 2019 |
| Melanie Grenier, CRNA | 1285887828 | Certified Registered Nurse Anesthetist | Aurora, CO | 2008 |
| Melissa Grenier | 1295513406 | Family Nurse Practitioner | Falls Church, VA | 2023 |
| Michael Grenier, LADC | 1083917397 | Addiction (Substance Use Disorder) Counselor | Norway, ME | 2010 |
| Michelle Grenier, MD | 1316027675 | Pediatric Cardiology Physician | Albuquerque, NM | 2006 |
| Molly Grenier, PMHNP | 1447587415 | Psychiatric/Mental Health Nurse Practitioner | Colorado Springs, CO | 2009 |
| Natalie Grenier, RN | 1083303960 | Registered Nurse | Cleveland, OH | 2023 |
| Nicole Grenier | 1174486997 | Behavior Technician | Moreno Valley, CA | 2025 |
| Nicole Grenier | 1508027210 | Mental Health Counselor | El Cajon, CA | 2008 |
| Nicole Grenier, M.D. | 1689899734 | Dermatology Physician | Warwick, RI | 2007 |
| Olivia Grenier | 1326529561 | Behavior Technician | Watertown, NY | 2018 |
| Pamela Grenier | 1659644136 | Occupational Therapy Assistant | South Windsor, CT | 2012 |
| Patricia Grenier, LCSW | 1265485296 | Clinical Social Worker | Waterville, ME | 2006 |
| Patricia Grenier, CNP | 1669952016 | Gerontology Nurse Practitioner | Mansfield, OH | 2018 |
| Patricia Grenier, MSPT | 1750562922 | Pediatric Physical Therapist | Milford, MA | 2007 |
| Paul Grenier, DC | 1184662561 | Chiropractor | Viroqua, WI | 2006 |
| Paul Grenier, O.D. | 1386608081 | Optometrist | Ann Arbor, MI | 2006 |
| Paul Grenier, D.C. | 1962503938 | Chiropractor | Worcester, MA | 2006 |
| Pierre-Olivier Grenier, M.D. | 1144881160 | Pediatric Dermatology Physician | Boston, MA | 2019 |
| Rachel Grenier, ARNP, DNP | 1386370443 | Family Medicine Physician | Pella, IA | 2022 |
| Rachel Grenier, MD | 1497214506 | Diagnostic Radiology Physician | Boston, MA | 2019 |
| Rachel Grenier | 1639552367 | Behavior Analyst | Newton, MA | 2015 |
| Richard Grenier, D.P.M. | 1588637193 | Podiatrist | Anaheim Hills, CA | 2006 |
| Rita Grenier, RPH | 1265561393 | Geriatric Pharmacist | Anchorage, AK | 2007 |
| Robert Grenier, PHARM. D. | 1306956552 | Pharmacist | Omaha, NE | 2006 |
| Roberta Grenier, CADC II | 1013376680 | Addiction (Substance Use Disorder) Counselor | North Bend, OR | 2016 |
| Robin Grenier, CT | 1417181090 | Counselor | Ashland, OH | 2009 |
| Ryan Grenier, DC | 1508418914 | Chiropractor | Wichita, KS | 2019 |
| Ryan Grenier | 1851240873 | Behavior Technician | Windsor, CT | 2026 |
| Samantha Grenier, PA-C | 1215393061 | Medical Physician Assistant | Boston, MA | 2016 |
| Sara Grenier, DPT | 1164824520 | Physical Therapist | Weatogue, CT | 2014 |
| Sherrie Grenier, OT | 1346374535 | Occupational Therapist | Lewiston, ME | 2007 |
| Stephanie Grenier, D.C. | 1134325798 | Chiropractor | Flowery Branch, GA | 2007 |
| Stephanie Grenier | 1932951647 | Addiction (Substance Use Disorder) Counselor | Maumee, OH | 2024 |
| Steven Grenier, LCDP | 1114755030 | Addiction (Substance Use Disorder) Counselor | Warwick, RI | 2024 |
| Susan Grenier | 1699234914 | Massage Therapist | Assonet, MA | 2019 |
| Taylor Grenier | 1528536216 | Occupational Therapist | Willow Street, PA | 2018 |
| Thomas Grenier, MD | 1316406580 | Physical Medicine & Rehabilitation Physician | Pensacola, FL | 2019 |
| Tiffany Grenier, BS | 1740522085 | Case Manager/Care Coordinator | Logansport, IN | 2013 |
| Tricia Grenier | 1245635945 | Contractor | Breckenridge, CO | 2014 |
| Tricia Grenier | 1548723208 | Physical Therapy Assistant | Lake Mary, FL | 2019 |
| Tyler Grenier, DO | 1396674255 | Student in an Organized Health Care Education/Training Program | Phoenix, AZ | 2026 |
| Tyler Grenier, RN | 1669304200 | Registered Nurse | Scottsville, KY | 2026 |
| Wendylynne Grenier, D.C. | 1598835852 | Chiropractor | Nashua, NH | 2006 |
| William Grenier, APRN, NP-C | 1154626521 | Family Nurse Practitioner | Louisville, KY | 2011 |
| Yannick Grenier, MD | 1083654875 | Neurological Surgery Physician | Cincinnati, OH | 2006 |
| Zachary Grenier | 1801756457 | Dental Hygienist | Milton, VT | 2025 |
| Dianexys Grenier Cruz | 1316558257 | Behavior Technician | Miami, FL | 2020 |
| Anna Grenier Pawlikowski, LISW | 1033403571 | Clinical Social Worker | Cleveland, OH | 2011 |
| Deanna Grenier-Mullins, N.P. | 1558372292 | Adult Health Nurse Practitioner | Palo Alto, CA | 2006 |
| Sarah Grenig | 1932742913 | Physical Therapist | Fishers, IN | 2019 |
| Katie Greniger, MSN, FNP-BC | 1356128524 | Internal Medicine Physician | Grand Rapids, MN | 2023 |
| John Grenillo, DC | 1023210358 | Chiropractor | Ann Arbor, MI | 2007 |
| Cale Grenillo-Weaver | 1831725647 | General Practice Dentistry | Lakewood, CO | 2020 |
| Dawn Grening, M.S., CCC-SLP | 1821424128 | Speech-Language Pathologist | Ellensburg, WA | 2013 |
| Nicolette Grening, PA-C | 1598378564 | Physician Assistant | Casper, WY | 2020 |
| Alexander Greninger, M.D. | 1124415062 | Clinical Pathology/Laboratory Medicine Physician | Seattle, WA | 2015 |
| April Greninger, MS | 1104004340 | Mental Health Counselor | Bothell, WA | 2008 |
| Ashley Greninger, CMT | 1043477185 | Specialist | Fort Collins, CO | 2008 |
| Christopher Greninger, LMP | 1013251008 | Counselor | Aberdeen, WA | 2012 |
| Daniel Greninger, M.D. | 1861666059 | Ophthalmology Physician | Antioch, CA | 2008 |
| Heather Greninger, APRN, CPNP-PC | 1730988007 | Pediatric Nurse Practitioner | Tulsa, OK | 2025 |
| Linda Greninger, NURSE PRACTITIONER | 1154488203 | Psychiatric/Mental Health Nurse Practitioner | Greensboro, NC | 2007 |
| Paula Greninger, LPC | 1417979006 | Mental Health Counselor | Nixa, MO | 2006 |
| Sally Greninger, M.A., LMFT | 1275689168 | Mental Health Counselor | Stockton, CA | 2007 |
| Samantha Greninger | 1215854807 | Prosthetist | Spokane, WA | 2026 |
| Shawna Greninger, CMA | 1770431751 | Phlebotomy Technician | Woodville, TX | 2026 |
| Tamara Greninger, RN | 1598937096 | Registered Nurse | Delta, CO | 2008 |
| Lila Greninger James, RN BSN | 1285228098 | General Practice Registered Nurse | Pensacola, FL | 2021 |
| Brittny Grenion | 1477427102 | Registered Nurse | Jamaica, NY | 2025 |
| Michael Grenis, MD | 1669546834 | Orthopaedic Surgery Physician | Princeton, NJ | 2006 |
| Myleena Grenis | 1396169843 | Clinical Social Worker | Iowa City, IA | 2014 |
| Margaret Grenisen, MD | 1447231766 | Family Medicine Physician | La Crosse, WI | 2005 |
| Mark Grenitz, M.D. | 1790746279 | Obstetrics & Gynecology Physician | Plantation, FL | 2006 |
| Robert Grenitz, M.D. | 1841423746 | Gynecology Physician | Weston, FL | 2009 |
| Kristal Greniuk-Wioncek, DDS | 1194842468 | General Practice Dentistry | Gaylord, MI | 2007 |
| Kathy Grenka | 1013365253 | Pharmacist | Hollywood, FL | 2016 |
| Alan Grenke, PA | 1073522215 | Physician Assistant | Tucson, AZ | 2006 |
| Ashley Grenke, LSW | 1366152738 | Social Worker | Dublin, OH | 2022 |
| Cynthia Grenke, LMSW | 1649519414 | Social Worker | Kansas City, MO | 2013 |
| Erin Grenke, LCPC | 1588834196 | Professional Counselor | Rockford, IL | 2008 |
| Jennifer Grenke, MA, BCBA, LBA | 1417497967 | Behavior Analyst | Monroe, MI | 2017 |
| Jennifer Grenke, NP | 1588361034 | Family Nurse Practitioner | Rockledge, FL | 2023 |
| Lucille Grenke, LMHC | 1215743315 | Mental Health Counselor | Issaquah, WA | 2024 |
| Hannah Grenko | 1326974619 | Behavior Analyst | Springfield, MO | 2026 |
| Johanna Grenko, LMSW | 1366099699 | Clinical Social Worker | Des Moines, IA | 2019 |
| Lydia Grenko | 1356276729 | Psychologist | Colorado Springs, CO | 2026 |
| Ronald Grenko, MD | 1861454571 | Anatomic Pathology & Clinical Pathology Physician | Lancaster, PA | 2006 |
| Mark Grenkoski, M.D. | 1174567754 | Emergency Medicine Physician | Robbinsville, NC | 2006 |
| Princess Grenlear, LMSW | 1174445795 | Social Worker | Waldorf, MD | 2026 |
| Devin Grenley, LMFTA | 1164945143 | Marriage & Family Therapist | Seattle, WA | 2017 |
| Philip Grenley, DO | 1629915152 | Student in an Organized Health Care Education/Training Program | Greenville, NC | 2026 |
| Robert Grenley | 1124223375 | Plastic Surgery Physician | Seattle, WA | 2007 |
| Dana Grenman, DC | 1730699794 | Chiropractor | Hot Springs, AR | 2017 |
| David Grenn, LPC, NCC, CADC | 1003228388 | Professional Counselor | Brownsville, TX | 2014 |
| Emily Grenn | 1306336920 | General Practice Physician | Jackson, MS | 2018 |
| Gordon Grenn | 1871603670 | Family Medicine Physician | Lake Worth, FL | 2006 |
| John Caleb Grenn, M.D. | 1225569635 | Internal Medicine Physician | Corpus Christi, TX | 2017 |
| Joseph Grenn, D.M.D. | 1245446509 | Endodontics | San Francisco, CA | 2007 |
| Monica Grenn | 1659191898 | Behavior Technician | San Antonio, TX | 2024 |
| Richard Grenn, DO | 1689201071 | Emergency Medicine Physician | Charlotte, NC | 2020 |
| Robert Grenn, MD | 1366079915 | Psychiatry Physician | Caro, MI | 2020 |
| Skyler Grenn | 1487517801 | Personal Care Attendant | Anchorage, AK | 2025 |
| Melissa Grenn-Fuller | 1083737761 | Speech-Language Pathologist | Meadville, PA | 2007 |
| Alexis Grennan | 1700557782 | Case Manager/Care Coordinator | Plattsburgh, NY | 2021 |
| Allison Grennan, PHD | 1295013175 | Psychologist | Omaha, NE | 2011 |
| Carol Grennan, DC, DACBN, CCN | 1346250602 | Chiropractor | Irving, TX | 2006 |
| Carri Grennan, CRNA | 1396024931 | Certified Registered Nurse Anesthetist | Chicago, IL | 2011 |
| Chloe Grennan, MA,LAC,NCC | 1588531461 | Counselor | Manasquan, NJ | 2025 |
| Christopher Grennan, MD | 1952620270 | Family Medicine Physician | Wamego, KS | 2010 |
| Dara Grennan | 1518282938 | Infectious Disease Physician | Dixon, IL | 2010 |
| Donna Grennan, SLP | 1538446836 | Speech-Language Pathologist | Wantagh, NY | 2011 |
| Hillary Grennan, LCSW | 1477982221 | Clinical Social Worker | New Providence, NJ | 2013 |
| Holly Grennan, SUDPT | 1235085341 | Addiction (Substance Use Disorder) Counselor | Wenatchee, WA | 2026 |
| Holly Grennan | 1235481698 | Mental Health Counselor | Portland, OR | 2012 |
| Jason Grennan, MD | 1457313314 | Diagnostic Radiology Physician | Omaha, NE | 2006 |
| Jill Grennan, M.D. | 1205010006 | Ophthalmology Physician | Omaha, NE | 2007 |
| Kathleen Grennan | 1750112363 | Mental Health Counselor | Raleigh, NC | 2024 |
| Kathleen Grennan, CNM, APRN | 1770857559 | Advanced Practice Midwife | Fort Worth, TX | 2012 |
| Kerry Grennan, NP | 1326299017 | Adult Health Nurse Practitioner | East Boston, MA | 2008 |
| Kim Grennan, RN | 1619308012 | Registered Nurse | Bayport, NY | 2013 |
| Krista Grennan, MD | 1093418428 | Internal Medicine Physician | Jacksonville, FL | 2023 |
| Lindsey Grennan, M.ED | 1841744620 | Addiction (Substance Use Disorder) Counselor | Fairbanks, AK | 2016 |
| Marianna Grennan, LCSW R | 1013188390 | Clinical Social Worker | Melville, NY | 2008 |
| Martin Grennan, M.D. | 1861560039 | Pain Medicine (Anesthesiology) Physician | Youngstown, OH | 2006 |
| Michael Grennan | 1669829933 | Physician Assistant | Gig Harbor, WA | 2016 |
| Michelle Grennan | 1760023071 | Pharmacist | Valley, NE | 2019 |
| Michelle Grennan, PH.D. | 1922544477 | Clinical Psychologist | Mount Vernon, NY | 2017 |
| Molly Grennan, BFA, RBT | 1629771456 | Behavior Technician | Nyack, NY | 2023 |
| Nicole Grennan | 1568886513 | Physical Therapist | Jacksonville, FL | 2014 |
| Olivia Grennan | 1790449791 | Case Manager/Care Coordinator | Columbus, OH | 2021 |
| Paul Grennan | 1942818570 | Mental Health Counselor | East Meadow, NY | 2020 |
| Sharon Grennan, B.S., LAC | 1922840511 | Addiction (Substance Use Disorder) Counselor | Salina, KS | 2024 |
| Stephanie Grennan, PA | 1730330036 | Physician Assistant | Abilene, KS | 2008 |
| Tim Grennan, MD | 1972681617 | Hematology & Oncology Physician | Sacramento, CA | 2006 |
| Wendy Grennan, MASTERS | 1992054191 | Counselor | Pawtucket, RI | 2012 |
| Amber Grennay | 1417675596 | Community Health Worker | Southfield, MI | 2022 |
| Catherine Grennell | 1487810495 | Occupational Therapist | Tucson, AZ | 2008 |
| Jacqueline Grennell, RD, LDN | 1699729764 | Registered Dietitian | Plymouth, MA | 2006 |
| Kelsey Grennell, PA-C | 1457177503 | Physician Assistant | Indianapolis, IN | 2024 |
| Mark Grennell | 1831020502 | Registered Nurse | Soquel, CA | 2026 |
| Matthew Grennell, BCABA | 1346575263 | Behavior Analyst | Maitland, FL | 2009 |
| Nicholas Grennell, DDS | 1528702347 | General Practice Dentistry | Minot, ND | 2022 |
| Nicole Grennell, FNP-C | 1699322909 | Nurse Practitioner | Ann Arbor, MI | 2019 |
| Rebekkah Grennell | 1750078143 | Personal Care Attendant | Huntington, WV | 2023 |
| Shanna Grennell, LPN | 1588998322 | Licensed Practical Nurse | Mount Vernon, OH | 2009 |
| Susanne Grennell, D.D.S. | 1013189711 | Dentist | Pleasant Valley, NY | 2008 |
| Kerri Grennen | 1417793522 | Counselor | Bremerton, WA | 2024 |
| Kelly Grenner, ARNP-FNP | 1003424128 | Family Nurse Practitioner | Bothell, WA | 2020 |
| Lawrence Grenner, LSW | 1104630359 | Social Worker | Waldwick, NJ | 2025 |
| Joann Grennes, PHARMD | 1194362988 | Pharmacist | Whitestown, IN | 2019 |
| Andrew Grennier, RN | 1710807771 | Registered Nurse | Palm Springs, CA | 2026 |
| Katherine Grennier, BSW | 1023359817 | School Social Worker | Little Rock, AR | 2013 |
| Kevin Grennier | 1467953182 | Physical Therapy Assistant | Troy, MI | 2018 |
| Courtney Grenning | 1225562341 | Speech-Language Pathologist | Lake Forest, IL | 2017 |
Source: CMS National Plan and Provider Enumeration System (NPPES) (download.cms.gov). A listing is not a recommendation: check a license with the state board (license lookups).